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一辆五十铃NKR客货车,已经行驶了22万km,发现其发动机(4JB,型)窜气严重。该发动机除了动力不足外,还存在早晨不易起动的故障,并且刚起动着的发动机加油困难,后来,在早晨干脆起动不着。检查整车油路,未发现问题,无奈,将喷油泵拆下认真检查,更换了柱塞、出油阀、转子输油泵,并按该机型技术参数调校喷油泵和喷油器,结果仍无济于事。最后查明,由于发动机窜气严重,发动机熄火后倒窜到曲轴箱内的、带有一定压力的气体,通过喷油泵正时齿轮轴的油封,把喷油泵腔体中的柴油
An Isuzu NKR passenger and freight vehicle has been traveling a total of 220,000 km and found that its engine (4JB, type) had a serious blow-by gas. In addition to the lack of motivation of the engine, there are also difficult to start the morning of failure, and just starting the engine refueling difficulties, and later, simply start in the morning. Check the vehicle circuit, did not find the problem, but unfortunately, the pump removed carefully check, replace the plunger, the valve, the rotor pump, and press the model technical parameters to adjust the fuel pump and injector, the results Still no use. Finally, it is ascertained that, due to the serious blow-by gas in the engine, the gas in the crankcase after the engine is turned off goes through the oil seal of the timing gear shaft of the fuel injection pump to inject the diesel oil in the fuel injection cavity